Table B-2. Average mechanical properties of piles. 





No. 



Fl 



axural Properties 









Average 



Type of 



of 



Modulus 



Modulus of 



Absorbed 



Compressive 



Treatment 



Test 



of 



Elasticity 



Energy 



Strength, 





Piles 



Rupture 



in Flexure 



in 



F c 







MPa 



GPa 



Flexure 

 kJ/m3 



MPa 



Fir 





Untreated 



5 



57.87 



13.25 



43.70 



23.07 



Creosote 



5 



47.31 



10.92 



28.97 



1 



ACA dual 2 



10 



42.13 



10.60 



21.09 



18.71 



CCA dual 2 



10 



26.50 



8.074 



23.19 



16.09 



ACA 



5 



38.75 



9.763 



14.33 



16.97 



Pine 







Untreated 



5 



55.21 



13.39 



36.13 



1 



Creosote 



5 



41.02 



1 



1 





ACA dual 2 



10 



32.58 



10.81 



19.51 





CCA dual 2 



10 



28.73 



9.935 



16.64 





ACA 



5 



38.16 



10.60 



__1 







CCA 



5 



37.30 



1 



1 







^o value is provided because of the large spread in measured 

 values for a small number of samples. 



2 Includes both air-dried and kiln-dried specimens (5 each). 



"Table 2 may be useful to the designer and planner. Data on strength 

 of piles found in handbooks usually refer to untreated piles. A designer 

 can obtain from Table 2 a rough estimate of the ratio of strength for his 

 choice of species and treatment compared to that of the stronger untreated 

 piles. Then the number of piles required for the job can be estimated." 



6. Conclusions 



"For Douglas fir piles, it is concluded that: 



(a) Dual treatment (ACA and creosote or CCA and creosote) or 

 treatment with only ACA will reduce some mechanical properties of 

 a pile more than treatment with creosote. For specific numerical 

 reduction refer to Table 2. 



(b) Of the two dual treatments, CCA and creosote reduces some 

 mechanical properties of a pile more than ACA and creosote (refer 

 to Table 2. 



(c) In dual treatments, kiln drying is more deleterious than 

 air drying." 



410 



